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Install Rails 3.1 RC

gem install rails --pre

generate new app, skipping Test::Unit file generation

rails new my_app -T

Set up Gemfile

# in Gemfilegem'haml'gem'haml-rails', :group => :developmentgem'simple_form'
group :testdogem'database_cleaner'gem'rails3-generators'#mainly for factory_girl & simple_form at this pointgem'rspec-rails'gem'factory_girl_rails'gem'cucumber-rails'gem'capybara'end